Sound amplifier



FIG. 1 is a front perspective view of a sound amplifier, showing our new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right-side elevational view thereof, the left-side elevational view being a mirror image thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines showing a mobile phone in FIG. 3 depict environmental matter and form no part of the claimed design. 

CLAIM We claim the ornamental design for a sound amplifier, as shown and described. 